Reasons for Thinning and Loss of Lubricating Grease

Reasons for Thinning and Loss of Lubricating Grease‌

Primary Causes and Mechanisms of Grease Thinning and Leakage‌

‌I. High-Temperature-Induced Thickener Structure Breakdown‌

The thickeners in grease (typically constituting 10%-30%) undergo physical structural changes under high-temperature conditions, reducing their ability to effectively retain the base oil. When the temperature exceeds the grease's dropping point, the grease gradually thins and may even flow. For example, prolonged use in high-temperature areas such as automobile engines can cause grease failure due to sustained heat exposure.

‌II. Impact of High-Shear Forces‌

High shear forces generated by mechanical operation disrupt the fibrous network structure of the thickener, leading to base oil separation. This thinning effect is particularly pronounced in high-speed bearings, gears, and other components.

‌III. Additive Degradation‌

‌Base Oil Oxidation‌: Prolonged high-temperature operation causes base oil oxidation and decomposition, reducing viscosity.

‌Additive Depletion‌: Antioxidants, extreme-pressure additives, and other additives gradually lose effectiveness, accelerating lubricant performance degradation.

‌IV. Contamination from External Sources‌

Water ingress causes grease emulsification.

Fuel dilution (e.g., gasoline penetration) significantly reduces consistency.

Metal shavings and other particulate matter disrupt grease structure.

‌V. Improper Product Selection‌

Using low-temperature grease in high-temperature environments.

Employing low-viscosity products under high-shear conditions.

SY0326 Grease leakage tester is in strict accordance with the SH/T0326 standard design and manufacture, the instrument into the sample after modification of the front wheel hub and shaft assembly, so that the hub and shaft under the specified conditions a total of 360±5min operation. ASTM D1263

Determine the leakage of grease or oil, and observe the bearing surface condition at the end of the sample.

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